The DIY gelatin recipe from IAgirl is my favorite! I have tried the generic joico k pak and it did nothing for me but some love it,
Sally's also has something called colorful neutral protein filler that a lot of people recommend. I think my hair is not impressed by keratin that's in the k pak

just answering because I read this a couple of times (other people and Firefox told it and she is very reliable): Eggprotein doesn't penetrate into the hair because the proteinparts are too large to be able to penetrate into the hair. You can maybe get other "good" results from egg, but it will not work as a protein treatment.